The Messenger of Allah (ﷺ) said: When the reciter (Imam) utters:" Not of those on whom (is Your) wrath and not the erring ones," and (the person) behind him utters Amin and his utterance synchronises with that of the dwellers of heavens, all his previous sins would be pardoned.
Reference: Sahih Muslim 410 f In-book : Book 4, Hadith 82 USC-MSA web (English) : Book 4, Hadith 816 (deprecated)
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